AFAIK, if you're over the maximum seat weight, then in the event of an accident your insurance is invalidated. So it's not worth the risk.
As to whether it's a safety issue to be a few pounds over the limit, I doubt if anyone on here really knows...which doesn't stop them having opinions! And whether you want to or can lose weight is completely irrelevant to the question you asked of course.
If I were you I'd fly the R44 - far nicer helicopter anyway.
